Cannula



FIG. 1 is a front elevation of a cannula, showing our new design, the side of the cannula opposite from that of FIG. 1 being identical with what is shown in FIG. 1;

FIG. 2 illustrates the cannula of FIG. 1 as seen from the right of FIG. 1, the cannula as viewed from the left of FIG. 1 being identical with what is shown in FIG. 2;

FIG. 3 is a top plan view of the cannula of FIG. 1; and

FIG. 4 is a bottom plan view of the cannula of FIG. 1. 

The ornamental design for a cannula, as shown and described. 